Breast-drill



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, Jj?. HARDISTY.

BREAST DRLL.

,386. Patented Mar. 18, 1884i No.y 295 INVBNTOR 1 L WI NBSSES; @ik WMM,

ATTORNEYS.

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Nrrnn Stains JOHN F. HARDISTY, OF BONAPARTE, IOWA.

BREAST-DRILL.

SPECIFICATION forming part of Letters Patent No. 295,386, dated March 18, 1884.

Application filed October 19, 1883.

To all whom t may concern:

Be it known that I, J @HN F. HARDis'rY, of Bonaparte, Van Buren county, Iowa, haveinvented a new and Improved Breast-Drill, of which the following is a full, clear, and exact description.

My invention consists of a screw-feed attaohment to hand or breast drills, said feed attachment being applied so as to be used or not, as may be preferred, and being adapted to save the operator considerable labor, and to enable the drill to do better work than without 'said feed attachment, as hereinafter fully described.

Reference is to be had to the accompanying drawings, forming part of this specication, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is aside elevation, with some partsin section, of a breast-drill with my improved feed attachment applied. Fig. 2 is a perspective view ci' portions of the drill, showing the application of a drill to a large piece of work, so as to use the feed attachment; and Fig. 3 is a side elevationof parts of the drill with a vise attached for holding the work.

I construct the drill-stock c with arms or brackets b and c ou the side opposite to the crank-gear d, which drives the spindle .of the drill-chuck c, and I t a strong bar, f, to slide in the bracket b, and also tit a feed-nut, g, in the bracket c, said feed-nut being fitted on the upper screwthreaded section, la., of the bar f, and having a toothed wheel, il, attached to one end, which gears with a bevel-pinion, j, attached to a thumb-bit, k, which is tted on the supporting-stud Z, projecting 'from the end of bracket c, so as to support said pinion j suitably to be turned by the thumb-bit k for working the feed-nut to draw the bar along the dri11-ch uck e. Thestudl projects into a groove, m, of the feednut g, to prevent the nut from shifting lengthwise by the stress of the bar f.

(No model.)

The lower end of this bar f carries a bracket, n, which serves for the work-table, the work being placed on it and forced against the drill by the feed-nut g, which is to be turned by the lei't hand of the operator, who turnstbe crankgear d by the right hand.

lf the piece of work is large and heavy, as at p in Fig. 2, the drill may be clamped to the surface of the same by a couple of bars, q, and bolts s, holding the drill upright on the work, or a vise, t, may be attached to the bracket n, as in Fig. 3. for holding the work by that means. The bracket a is iitted to the bar f withva binding-screw, u, to be shifted along the bar, according to the size of the work to be drilled.

The barf may be taken off at any time by turning the feed-nut g backward and screwing the bar out ofthe nut. The'bar is iitted parallel to the stock a, and thus will feed the work correctly and so as to be bored truly when the work is placed squarely to the face of the bracket n.

Having thus described my invention,I claim as new and desire to secure by Letters Patentl. In a breast-drill, the combination, with l the drillstock a., provided with the brackets b c, of the feed-barf, havingthe screw-thread ed section h, and carrying the bracket n, the feed-nut g, arranged in the bracket c, and mea-ns for turning said nut, substantially7 as herein shown and described.'

2. The feed-nut g, having groove m, and bevel-wheel 1'., thumb-bit It, having pinion j, and the stud-pin l., supporting the thumb-bit and securing the feed-nut, in combination with the feedbar f and drill-stock a, substantially as described.

JOHN F. HABDIS'IY. 

